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3 years ago

List the four main components of air in their molecular form.

Biology

1 answer:

ruslelena [56]3 years ago

7 0

Answer:

Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.

Explanation:

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Bacteria are important because they _______. (Please select all correct responses.) * 1 point

Lostsunrise [7]

I think its option b, may carry out nitrogen fixation.

8 0

3 years ago

Can ecilpses occur on other planets

snow_tiger [21]

Answer:

The answer is no. Total solar eclipses can happen on other planets too, as long as they have moons that are big enough to cover the sun's disk from the planet's perspective and orbit the planet on the same plane as the sun, astronomers told Live Science.

Explanation:

7 0

3 years ago

Read 2 more answers

In bean plants, Mendel found that the allele for smooth seeds (S) is dominant, while the allele for wrinkled seeds (s) is recess

Masteriza [31]

Homozygous recessive means that both plants will have ss alleles so all of their offspring will be ss

3 0

3 years ago

Which features is least useful in assigning the phylum cycliophora to a clade of animals?

Musya8 [376]

Answer:

Having a true coelom as a body cavity.

Explanation:

Coelomate contain tissues derived from mesoderm, whereas pseudocoelomates have no such tissue. have a gut that lacks suspension within the body cavity, whereas pseudocoelomates have mesenteries that hold the digestive system in place. Have a body cavity completely lined by mesodermal tissue, whereas pseudocoelomates do not.

4 0

3 years ago

Correctly identify each of these definitions or examples as either depolarization or hyperpolarization of the plasma membrane. 1

natulia [17]

Answer:

hyperpolarization
depolarization
hyperpolarization
depolarization
hyperpolarization
depolarization
depolarization

Explanation:

The resting membrane potential is balanced by ion leakage and ion pumping, to get an electrical signal started the membrane potential has to lose its balance. This starts with a membrane channel opening for Na+ since Na+ concentration is higher outside the cell, ions will rush into the cell. This will change the relative voltage inside the cell. The resting potential has a voltage of -70 mV, the sodium cation entering the cell cause it to become less negative. This is known as depolarization.

The concentration gradient for Na+ will continue to enter the cell making the voltage to become positive reaching +30 mV. At the same time, this happens, other voltage-gated channels are also opening, a concentration gradient acts on K+, as well, as it leaves the cell, it takes a positive charge with it making the membrane potential to move back to its resting voltage of -70 mV. This is called repolarization.

For potassium ions to reach equilibrium the membrane voltage needs to be below -70 mV, this leads to a period of hyperpolarization that occurs while the K+ channels are open.

I annexed an image that illustrates this action potential process.

Considering the information given during depolarization there's an increase in the number of sodium leak channels (7) making the inside of the cell more positive (2) increase in the membrane potential (4), this also implies a decrease in the extracellular concentration of potassium (6)

Meanwhile, during hyperpolarization an increase in the extracellular concentration of potassium (3) decreases the membrane potential (1) making the inside of the cell more negative (5).

I hope you find this information useful and interesting! Good luck!

4 0

3 years ago